Did you know that sleep deprivation increases ghrelin (the "hunger hormone.") while suppressing leptin (the "satiety hormone")? Interestingly, these alterations in hormone levels are often accompanied by changes in food preferences, leading you to opt for high carbohydrate foods like pizza, pasta, and sweets. The downstream effects of these food choices are weight gain and metabolic dysfunction. In this clip, Dr. Matthew Walker describes how sleep deprivation drives a preferential desire for high carbohydrate foods.